BigBlonde
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Thanks! I have only one tent fan. I've read some different opinions about pushing air in or pulling it out. I chose to push air in from the top to create positive air pressure. There are two vents open on the opposite side of the tent to exhaust the air. The lights can be hot, so I'm adding small fans to the heat sinks. I have one installed so far and it made a big difference. I'm thinking of adding heat sinks to the power supplies.Strictly speaking. You don't need a fan to push air in to your tent, rather a decent fan blowing out of the tent preferably at the top most part of the tent above the lights to exhaust any humidity and heat that builds up. The tent will passively intake air from its vent flaps out of the room it's in.
If for whatever reason you are piping air in via a fan, the exhaust fan MUST be rated the same or higher otherwise you will be pushing more air into the tent than you are exhausting. Causing the excess air to flow out of the tent seams and vent flaps rendering your exhaust fan useless. You dont need a filter on your exhaust if you're not worried about smell.
200cfm is enough for a 4x4. Hope this helps. I can try and clarify any follow up questions you have.
Good point about the speed! I also don't like the noise when a fan is running full speed. The fan I'm using now is very loud.Go with the T6. The ratings are at full speed. You don't want your fan running at full speed all the time. The controller 67 will help regulate the temp/humidity in the tent. Carbon filter is only needed to remove odor.
I'm finding that controlling heat and humidity can be quite a challenge. It depends so much on what the weather is doing. We've had a cold spring and summer so far, so I've had to vent the room during the day and heat it during the night. It's starting to get hot here now, though.You can do both. But a couple things make it advantageous to use exhaust.
1. The exhaust moves all the heat out of the tent and even to room if you just pipe it outside. So the room the tent is in doesnt heat up as much.
2. Filtering an active intake (fan forced air) is harder than filtering and passive intake. For the most part, the mesh on the tent flaps is enough filter to keep out bugs, hair and lint/ household dust because there are several vents and they dint have to work very hard to supply air. But if you're forcing air in the tent without a filter youre likely to get bugs hair lint and dust in your tent and on your plant. Filtering the intake of the fan would cost more and also take up more room since the filter you would need would be large to not restrict airflow.
Also I cant claim any science behind this, but I find my grows always run best when I have a little negative pressure in the tent.
Just some food for thought.
Two fans can run on the same controller?! That's very useful information. I haven't got myself so deep into this yet to read product documentation. It seems the AC Infinity fans are a popular choice, so I'll probably go with them.I run two ac infinity fans on my tent. I have a 6” as exhaust and a 4” for supply. Both running on same 67 controller with minimum speed at 4 and max 10. Works well. Tent is 3x3.
I run both because passive intake wasnt enough alone to keep temps down and rh where I wanted it and tent sides were always really sucked in. I was also just running 4” originally. Bought the 6” and replaced the 4” as exhaust at top of tent. I took that 4”” and put it as a supply at the bottom. Both are plugged into the same 67 controller which is Bluetooth enabled. I’ll be replacing that controller with ac infinity’s 69 controller that is WiFi enabled.Two fans can run on the same controller?! That's very useful information. I haven't got myself so deep into this yet to read product documentation. It seems the AC Infinity fans are a popular choice, so I'll probably go with them.
Why are you using two fans? How do you have them configured? Do you intake at the bottom and exhaust out the top?
Do you run a dehumidifier during dark cycle and shut the humidifier off if one is running?Here's a day in the life of my plants. I think I need to work on the temperature and humidity changes during the lights-off time (11 PM to 5 AM).
I agree. I have a T6 in a 5 x 5 and so far it's keeping up with two 2000w LED's but I would like a little more headroom and wish I had gone with the 8" fan. I've set the lung room temp to 73* and the tent is running between 76* and 80* with lights on and 73* to 75* at night. RH is averaging out to around 54% but I'm dehumidifying the lung room. VPD has averaged between .84 and 1.37For a 4x4 tent I would do a 8" AC Infinity so I could get my cfm at lower rpms and keep it quiet. I run a 6" units in my 2x4 and 3x3. Always exhaust air from the top of the tent,,,, Heat rises. I use my exhaust fans to control temp and exhaust excessive humidity into the grow room. The central A/C system has enough capacity to extract the humidity from the living space. I use a Inkbird control to control a 1 gal or 1.3 gal humidifier in the tents when I need to get the RH up in the fall and winter months mostly. I have way more total lighting power in my tents than needed by most peoples measure. In the summer months I can turn the dimmers down, keeps the lights close to the plants and still maintain fantastic light coverage and keep the temps down. Come fall and winter I can raise the lights higher, turn the dimmers up and use the extra heat the lights put out to heat the grow space. This does require a tall tent. I also always keep at least 3ea. 6" small circ fans in the tent. 2ea. in the grow space and one above the light. Always keep them on low to gently move the plant tops around and one above the light on low during the summer months to cool the lights and have the warm air ready to be extracted by the exhaust fan. On high during the fall and winter to force warmer air down into the grow space. Good Luck!
Those controllers are easy to learn to use and have a bluetooth app. You can just run them in simple on/off mode until you learn how to use the advanced features (you can create scheduling and triggers to change fan speed at different temp/humidity points).Good point about the speed! I also don't like the noise when a fan is running full speed. The fan I'm using now is very loud.
I'm thinking the controller for an additional $30 is the way to go. I would probably regret not getting it. I guess I'm just not sure about how to use it.
I'll probably pass on the filter, for now. It may be more important when the weather is cold and we won't be able to ventilate the room like we do now.
Hey, I've bought cheap 6" inline fans and added BBQ fan controller's with hot glue on the housing to attach. I then 6" to 4" Y for 2 lines as cool input air sucked from a cooler unheated lower basement with fine mesh drawstring bags ( $1 Dollar store ) over both ends...Its not perfect but keeps out bugs and heavy dust.. My tents exhaust is another cheap 6" inline with same controller and filters, no Y added. I'm not worried about the smell, I can adjust the output air to be close to the input. I add input air because I like to add cooler air into the bottom of my tent.We're thinking about adding an in-line fan and have some questions.
Would the AC Infinity T4 model be right for our 107 cu ft tent?
Would it be better to buy the model with the temperature and humidity controller?
Do we need a filter? We aren't worried about the aroma from the plants. Is there anything else to consider? The tent is not in an occupied part of our home.
Background: This is our first grow in a tent under lights. We have a 4x4x6.5 tent with two Viaspectra XS2000 LED lights. We are currently using a 200 CFM fan that pushes air into the tent. We currently growing two Black Jack autoflower plants that are beginning the flowering stage. The plants seem healthy in spite of us having made our share of mistakes.
I'm glad I asked.I run both because passive intake wasnt enough alone to keep temps down and rh where I wanted it and tent sides were always really sucked in. I was also just running 4” originally. Bought the 6” and replaced the 4” as exhaust at top of tent. I took that 4”” and put it as a supply at the bottom. Both are plugged into the same 67 controller which is Bluetooth enabled. I’ll be replacing that controller with ac infinity’s 69 controller that is WiFi enabled.
I don't have a dehumidifier or humidifier. We usually have high humidity here, so a dehumidifier may be what I need. I may need one of those more than I need to upgrade my ventilation.Do you run a dehumidifier during dark cycle and shut the humidifier off if one is running?
Thinking you need both. Dehumidifier and upgraded exhaust and supply. I’m pretty sure all ac infinity cloudline models with temp & rh control come standard now with the newer Bluetooth enabled 67 controllers. Folks that are getting outdated controllers are probably getting old stock from there local grow shop or other online retailer. Order direct from ac infinity and you’ll get current hardware.I don't have a dehumidifier or humidifier. We usually have high humidity here, so a dehumidifier may be what I need. I may need one of those more than I need to upgrade my ventilation.
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